flashchips.c: Add support for XMC new SPI flash types

Adds initial support for the follow SPI flash chips:

 XM25QU64C
 XM25QU128C
 XM25QU256C
 XM25QH64C
 XM25QH128C
 XM25QH256C

BUG=none
TEST=builds

Signed-off-by: Luke He <sixuerain@qq.com>
Change-Id: I15c51b0f1ed789bcb2cabe33bc830f8d5d916969
Reviewed-on: https://review.coreboot.org/c/flashrom/+/48949
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2 files changed