cpu/amd/pi: Use alloc_cbmem() only in ramstage

Without this change the builder would fail with the complaint
that there was a global static variable in romstage. alloc_cbmem()
is only called in ramstage. The alternative was to add
*/cpu/amd/pi/*.romstage.o to the list of illegal_globals
EXCLUDE_FILEs in arch/x86/init/romstage.ld.

TEST: Booted the amd/lamar board.

Change-Id: I5167910ff790a3152a4ad8e5af0a4a3b17894f0f
Signed-off-by: Dave Frodin <dave.frodin@se-eng.com>
Reviewed-on: http://review.coreboot.org/8256
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
1 file changed