Split MAYBE_STATIC to _BSS and _NONZERO variants

These are required to cover the absensce of .data and
.bss sections in some programs, most notably ARCH_X86
in execute-in-place with cache-as-ram.

Change-Id: I80485ebac94b88c5864a949b17ad1dccdfda6a40
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35003
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/lib/lzma.c

@@ -26,7 +26,7 @@ size_t ulzman(const void *src, size_t srcn, void *dst, size_t dstn)
 	int res;
 	CLzmaDecoderState state;
 	SizeT mallocneeds;
-	MAYBE_STATIC unsigned char scratchpad[15980];
+	MAYBE_STATIC_BSS unsigned char scratchpad[15980];
 	const unsigned char *cp;
 
 	memcpy(properties, src, LZMA_PROPERTIES_SIZE);