[PATCH] Change prefix of chip id #defines

[Mattias Mattsson]

This patch changes the prefix of chip constant #defines in the following way:

AM_nnnnnnn -> AMD_AMnnnnnnn
AT_nnnnnnn -> ATMEL_ATnnnnnnn
EN_nnnnnnn -> EON_ENnnnnnnn
MBMnnnnnnn -> FUJITSU_MBMnnnnnnn
MX_ID -> MACRONIX_ID
MX_nnnnnnn -> MACRONIX_MXnnnnnnn
PMC_nnnnnnn -> PMC_PMnnnnnnn
SST_nnnnnnn -> SST_SSTnnnnnnn

It leaves the Intel #defines alone because there is another pending
patch for that:
http://patchwork.coreboot.org/patch/1937/

Some background discussion here:
http://www.flashrom.org/pipermail/flashrom/2010-July/004059.html

Signed-off-by: Mattias Mattsson