loadtools/scripts: gtm900.config renamed to gen4.config It turns out that a GTM900 variant exists with 8 MiB flash, thus -h gen8 needs to be used for GTM900 modules as the general case, and the old -h gtm900 config is best renamed to -h gen4, although not currently official for any actual target.

s,^CC=.*$,CC=	/opt/arm-2012.03/bin/arm-none-linux-gnueabi-gcc,
s,^CFLAGS=.*$,CFLAGS=	-O2 -march=armv4t -mtune=arm920t -DGTA0x_AP_BUILD,
s,^PROGS=.*$,PROGS=	fc-iram fc-loadtool fc-xram,
s,^EXTRA_OBJ=.*$,EXTRA_OBJ=	compaldummy.o gtapower.o,