SPI/SST: Add OpCode Enable-Write-Status-Register (EWSR)

For SST chips, the Write-Status-Register instruction must be
executed immediately after the execution of the
Enable-Write-Status-Register instruction, instead of Write-Enable.

Change-Id: I4b3473cd671829def3bd1641ececcf8d9dad4a56
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: zbao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/1919
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
1 file changed