Initial commit for the Sony NWZ linux port

SUPPORTED SERIES:
- NWZ-E450
- NWZ-E460
- NWZ-E470
- NWZ-E580
- NWZ-A10

NOTES:
- bootloader makefile convert an extra font to be installed alongside the bootloader
  since sysfont is way too small
- the toolsicon bitmap comes from the Oxygen iconset
- touchscreen driver is untested

TODO:
- implement audio routing driver (pcm is handled by pcm-alsa)
- fix playback: it crashes on illegal instruction in DEBUG builds
- find out why the browser starts at / instead of /contents
- implement radio support
- implement return to OF for usb handling
- calibrate battery curve (NB: of can report a battery level on a 0-5 scale but
  probabl don't want to use that ?)
- implement simulator build (we need a nice image of the player)
- figure out if we can detect jack removal

POTENTIAL TODOS:
- try to build a usb serial gadget and gdbserver

Change-Id: Ic77d71e0651355d47cc4e423a40fb64a60c69a80

firmware/asm/SOURCES

@@ -15,7 +15,7 @@ mempcpy.c
     defined(CREATIVE_ZVx) || defined(SANSA_CONNECT) || defined(SANSA_FUZEPLUS) || \
     defined(COWON_D2) || defined(MINI2440) || defined(SAMSUNG_YPR0) || \
     defined(SAMSUNG_YPR1) || defined(DX50) || defined(DX90) || (defined(MROBE_500) && !defined(LCD_USE_DMA)) || \
-    defined(CREATIVE_ZEN) || defined(CREATIVE_ZENXFI)) && \
+    defined(CREATIVE_ZEN) || defined(CREATIVE_ZENXFI) || defined(SONY_NWZ_LINUX)) && \
     !defined(SIMULATOR)
 #if LCD_DEPTH == 24
 lcd-as-memframe-24bit.c