vendorcode/amd/pi/00730F01/Lib/amdlib.c: Remove optimize attribute

Remove '__attribute__((optimize("Os")))' as it is unlikely to be
necessary as it is not used in other families that have the same
code and only hides deeper issues.

Change-Id: Ica890812ebc2fb659b9c3e46b40cf3f6534b3cf2
Signed-off-by: Bruce Griffith <Bruce.Griffith@se-eng.com>
Reviewed-on: http://review.coreboot.org/7689
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>