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.

	.text
	.code	32
	.globl	memcpy32
memcpy32:
1:	subs	r2, r2, #4
	ldrcs	r3, [r1], #4
	strcs	r3, [r0], #4
	bhi	1b
	bx	lr