qualcomm/ipq806x: centralize vboot configuration

vboot configuration (separate stage or not, which stage loads romstage)
depends on SoC properties (eg. amount of SRAM), not on board specifics, so
move this part of the configuration to the SoC.

Change-Id: I70b4cd1794ddf2aba7cdae94859ea1d76ae019f4
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10702
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/mainboard/google/storm/Kconfig

@@ -29,7 +29,6 @@ config BOARD_SPECIFIC_OPTIONS
 	select DRIVERS_I2C_WW_RING
 	select HAVE_HARD_RESET
 	select MAINBOARD_HAS_CHROMEOS
-	select RETURN_FROM_VERSTAGE
 	select SPI_FLASH
 	select SPI_FLASH_SPANSION
 	select SPI_FLASH_STMICRO

src/soc/qualcomm/ipq806x/Kconfig

@@ -10,6 +10,8 @@ config SOC_QC_IPQ806X
 	select HAVE_UART_SPECIAL
 	select SPI_ATOMIC_SEQUENCING
 	select GENERIC_GPIO_LIB
+	select SEPARATE_VERSTAGE
+	select RETURN_FROM_VERSTAGE
 
 if SOC_QC_IPQ806X