nwztools/database: misc improvements

* make gen_db.py work on Windows/Python 2

- use hashlib module instead of md5sum, also don't rely on / for file path
matching
- don't use 'file' for a variable name

* fix parse_nvp_header.sh for older kernels

pre-emmc kernel sources use a slightly different #define format; adjust
regexp to catch it.

* add nwz-x1000 series NVP layout (from icx1087_nvp.h)

some new tags have no description, alas the driver doesn't have
them :/

*  minor fixes to nvp/README

fixed typos/wording

Change-Id: I77d8c2704be2f2316e32aadcfd362df7102360d4

utils/nwztools/database/nvp/nwz-x1000.txt

@@ -0,0 +1,82 @@
+app,0
+bti,1
+hdi,2
+cng,3
+ser,4
+dg0,5
+dg1,6
+dcc,7
+mdl,8
+fup,9
+bok,10
+shp,11
+dba,12
+dbv,13
+tr0,14
+tr1,15
+mid,16
+tst,17
+gty,18
+fui,19
+lbi,20
+dor,21
+edw,22
+ubp,23
+syi,24
+var,25
+pcd,26
+dbs,27
+rnd,28
+ufn,29
+sdp,30
+ncp,31
+kas,32
+pnc,33
+rtc,34
+bpr,35
+e00,36
+e01,37
+e02,38
+e03,39
+e04,40
+e05,41
+e06,42
+e07,43
+e08,44
+e09,45
+e10,46
+e11,47
+e12,48
+e13,49
+e14,50
+e15,51
+e16,52
+e17,53
+e18,54
+e19,55
+e20,56
+e21,57
+e22,58
+e23,59
+e24,60
+e25,61
+e26,62
+e27,63
+e28,64
+e29,65
+e30,66
+e31,67
+clv,68
+slp,69
+ipt,70
+ep0,71
+ep1,72
+ep2,73
+ep3,74
+pts,75
+skt,76
+mac,77
+apd,78
+blf,79
+hld,80
+skd,81