Arm-Cortex-R82: Add MPU support (#1347)

* arm-cortex-r82: Add MPU support

This commit introduces support for the Memory Protection Unit (MPU)
to the ARM Cortex-R82 port. The MPU enhances system security
by allowing the definition of memory regions with specific access
permissions. The following changes have been made:
- Added MPU configuration functions in `port.c` to set up memory
  regions and their attributes.
- Updated `portASM.S` to include assembly routines for MPU
  and context switching with MPU support.
- Created `mpu_wrappers_v2_asm.c` to provide assembly wrappers for
  MPU operations.
- Updated `portmacro.h` to include MPU-related macros and definitions.
- Modified `task.h` to include MPU-related task attributes.
- Updated `CMakeLists.txt` to include the new MPU source file.
- Enhanced the `README.md` with instructions on MPU configuration.

Signed-off-by: Ahmed Ismail <Ahmed.Ismail@arm.com>

* cortex-r82: Minor code improvements

This commit includes minor code improvements to enhance readability
and maintainability of the Cortex-R82 port files. Changes include
refactoring variable names, optimizing comments, and improving code
structure without altering functionality.

Signed-off-by: Ahmed Ismail <Ahmed.Ismail@arm.com>

* tasks: Disable stack-depth check if MPU wrappers is set

This stack-depth check should not be performed for ports
where portUSING_MPU_WRAPPERS is set to 1.
In this case, pxTopOfStack and pxNewTCB->pxTopOfStack reside
in different memory regions: pxTopOfStack is in unprivileged SRAM,
while pxNewTCB->pxTopOfStack is in privileged SRAM.
This is because pxPortInitialiseStack() returns the address of
`ullContext` array rather than the decremented pxTopOfStack,
as is done in the non-MPU case.
Consequently, this check is not valid in this scenario.

Signed-off-by: Ahmed Ismail <Ahmed.Ismail@arm.com>

---------

Signed-off-by: Ahmed Ismail <Ahmed.Ismail@arm.com>

.github/.cSpellWords.txt

@@ -70,6 +70,7 @@ CANTX
 capitalisation
 cbmc
 CBMC
+cbnz
 cbor
 CBOR
 CCIE
@@ -108,6 +109,8 @@ CLKS
 CLKSOURCE
 CLKSTA
 CLRB
+clrex
+CLREX
 CLRF
 clrm
 CLRPSW
@@ -379,6 +382,7 @@ IFSR
 imajeff
 INACK
 INDF
+initialisations
 inpw
 INTE
 INTFRCH
@@ -652,6 +656,8 @@ PPUDR
 PPUER
 PPUSR
 ppux
+Prbar
+PRBAR
 PRCR
 PREA
 PREB
@@ -659,11 +665,15 @@ PRIA
 Prioritised
 PRIS
 PRIVDEFENA
+Prlar
+PRLAR
 PROCDLY
 PRODH
 PRODL
 PROGE
 Prokic
+Prselr
+PRSELR
 prtmacro
 psha
 psplim
@@ -706,6 +716,7 @@ REENT
 REGA
 RELD
 Renesas
+restoreallgpregisters
 reta
 reti
 RETP
@@ -773,6 +784,8 @@ SCBR
 SCDR
 SCER
 SCSR
+Sctlr
+SCTLR
 SDCC
 SECU
 SENDA
@@ -930,6 +943,7 @@ UNSUB
 UNSUBACK
 unsubscriptions
 unsuspended
+unupdated
 UPAC
 URAD
 URAT