mb/apple/macbookair4_2: Drop unnecessary select

`GFX_GMA_PANEL_1_ON_EDP` already defaults to `y` on Sandy Bridge.

Change-Id: I481754dc4f086469216c6e939c77b3c84bebea08
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55391
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Evgeny Zinoviev <me@ch1p.io>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/apple/macbookair4_2/Kconfig b/src/mainboard/apple/macbookair4_2/Kconfig
index 3c39eec..0f129a8 100644
--- a/src/mainboard/apple/macbookair4_2/Kconfig
+++ b/src/mainboard/apple/macbookair4_2/Kconfig
@@ -12,7 +12,6 @@
 	select SERIRQ_CONTINUOUS_MODE
 	select SOUTHBRIDGE_INTEL_BD82X6X
 	select SYSTEM_TYPE_LAPTOP
-	select GFX_GMA_PANEL_1_ON_EDP
 	select MAINBOARD_HAS_LIBGFXINIT
 	select HAVE_CMOS_DEFAULT
 	select HAVE_OPTION_TABLE