Fix Kconfig: ALWAYS_LOAD_OPROM has unmet dependency VGA_ROM_RUN

Broadwell and Skylake chipsets, along with a few mainboards were
selecting ALWAYS_LOAD_OPROM without making sure that the dependency
for that symbol was met as well.

Looking at the dependencies for VGA_RUN_ROM, we see:
PCI && !PAYLOAD_SEABIOS && !MAINBOARD_DO_NATIVE_VGA_INIT

Since ARCH_X86 selects PCI, that's always met here.
Since Broadwell and Skylake don't have native VGA init yet, that's
not needed.

- Make sure that VGA_RUN_ROM is selected as well.
- Add dependency on !PAYLOAD_SEABIOS for both ALWAYS_LOAD_OPROM and
VGA_RUN_ROM symbols where they're selected.

Fixes Kconfig warning for these boards and chipsets:
warning: (BOARD_SPECIFIC_OPTIONS && BOARD_SPECIFIC_OPTIONS &&
BOARD_SPECIFIC_OPTIONS && CPU_SPECIFIC_OPTIONS && CPU_SPECIFIC_OPTIONS)
selects ALWAYS_LOAD_OPROM which has unmet direct dependencies
(VGA_ROM_RUN)

Change-Id: I787a87e9467e1fc7afe8b04864b2a89b54824b9f
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: http://review.coreboot.org/11246
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/mainboard/intel/strago/Kconfig

@@ -2,7 +2,8 @@ if BOARD_INTEL_STRAGO
 
 config BOARD_SPECIFIC_OPTIONS
 	def_bool y
-	select ALWAYS_LOAD_OPROM
+	select VGA_ROM_RUN if !PAYLOAD_SEABIOS
+	select ALWAYS_LOAD_OPROM if !PAYLOAD_SEABIOS
 	select BOARD_ROMSIZE_KB_8192
 	select CHROMEOS
 	select CHROMEOS_VBNV_CMOS