linux: Enable EFI support

Newer systems, like the Dell OptiPlex 5055, have problems with legacy
boot, so enable EFI support.

> This enables the kernel to use EFI runtime services that are available
> (such as the EFI variable services).

Additionally, enable the frame buffer device driver.

> This is the EFI frame buffer device driver. If the firmware on
> your platform is EFI 1.10 or UEFI 2.0, select Y to add support for
> using the EFI framebuffer as your console.

It can only be built into the Linux kernel, so built the frame buffer
device into the Linux kernel too.

linux-4.14.67-217.bee

@@ -131,6 +131,7 @@ mee_configure() {
 	CONFIG_X86_CPUID=m
 	CONFIG_NUMA=y
 	CONFIG_TRANSPARENT_HUGEPAGE=y
+	CONFIG_EFI=y
 	CONFIG_HZ_1000=y
 	CONFIG_KEXEC=y
 	CONFIG_KEXEC_FILE=y
@@ -669,11 +670,13 @@ mee_configure() {
 	CONFIG_DRM_CIRRUS_QEMU=m
 	CONFIG_DRM_BOCHS=m
 	CONFIG_DRM_TINYDRM=m
+	CONFIG_FB=y
 	CONFIG_FB_CIRRUS=m
 	CONFIG_FB_PM2=m
 	CONFIG_FB_CYBER2000=m
 	CONFIG_FB_ARC=m
 	CONFIG_FB_VGA16=m
+	CONFIG_FB_EFI=y
 	CONFIG_FB_NVIDIA=m
 	CONFIG_FB_NVIDIA_I2C=y
 	CONFIG_FB_NVIDIA_DEBUG=y
@@ -691,7 +694,6 @@ mee_configure() {
 	CONFIG_FB_UDL=m
 	CONFIG_FB_IBM_GXT4500=m
 	CONFIG_LCD_PLATFORM=m
-	CONFIG_BACKLIGHT_CLASS_DEVICE=y
 	CONFIG_BACKLIGHT_CARILLO_RANCH=m
 	CONFIG_BACKLIGHT_APPLE=m
 	CONFIG_BACKLIGHT_PM8941_WLED=m
@@ -783,6 +785,7 @@ mee_configure() {
 	CONFIG_GOOGLE_FIRMWARE=y
 	CONFIG_GOOGLE_COREBOOT_TABLE_ACPI=m
 	CONFIG_GOOGLE_MEMCONSOLE_COREBOOT=m
+	CONFIG_EFI_VARS=y
 	CONFIG_EXT2_FS=y
 	CONFIG_EXT3_FS=m
 	CONFIG_EXT3_FS_POSIX_ACL=y