SPI: Fix and enable Fast Read support

- Fix handling of 5-byte Fast Read command in the ICH SPI
driver.  This fix is ported from the U-boot driver.
- Allow CONFIG_SPI_FLASH_NO_FAST_READ to be overridden by
defining a name for the bool in Kconfig and removing the
forced select in southbridge config
- Fix use of CONFIG_SPI_FLASH_NO_FAST_READ in SPI drivers
to use #if instead of #ifdef
- Relocate flash functions in SMM so they are usable.
This really only needs to happen for read function pointer
since it uses a global function rather than a static one from
the chip, but it is good to ensure the rest are set up
correctly as well.

Change-Id: Ic1bb0764cb111f96dd8a389d83b39fe8f5e72fbd
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/1775
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/drivers/spi/gigadevice.c

@@ -154,7 +154,7 @@ static int gigadevice_write(struct spi_flash *flash, u32 offset,
 		cmd[3] = offset & 0xff;
 #if CONFIG_DEBUG_SPI_FLASH
 		printk(BIOS_SPEW,
-		       "PP gigadevice.c: %#p => cmd = { %#02x %#02x%02x%02x }"
+		       "PP gigadevice.c: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x }"
 		       " chunk_len = %zu\n", buf + actual,
 		       cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
 #endif
@@ -226,7 +226,7 @@ struct spi_flash *spi_flash_probe_gigadevice(struct spi_slave *spi, u8 *idcode)
 
 	stm->flash.write = gigadevice_write;
 	stm->flash.erase = gigadevice_erase;
-#ifdef CONFIG_SPI_FLASH_NO_FAST_READ
+#if CONFIG_SPI_FLASH_NO_FAST_READ
 	stm->flash.read = spi_flash_cmd_read_slow;
 #else
 	stm->flash.read = spi_flash_cmd_read_fast;