ArmPlatformPkg: create hw-agnostic LcdGraphicsOutputDxe driver

Create a new LcdGraphicsOutputDxe driver from the existing sources that
takes its hardware abstractions from a LcdHwLib library instance rather
than from a .c file linked directly. All we need is a new .inf file, and
a minimal tweak to LcdGraphicsOutputDxe.h to reuse the LcdHwlib prototypes
rather than open code them.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Girish Pathak <girish.pathak@arm.com>
Signed-off-by: Evan Lloyd <evan.lloyd@arm.com>
[ardb: add it to ArmPlatformPkg.dsc so we can build test it standalone]
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

ArmPlatformPkg/Drivers/LcdGraphicsOutputDxe/LcdGraphicsOutputDxe.h

@@ -18,6 +18,7 @@
 #include <Base.h>
 
 #include <Library/DebugLib.h>
+#include <Library/LcdHwLib.h>
 #include <Library/LcdPlatformLib.h>
 #include <Library/PcdLib.h>
 #include <Library/UefiLib.h>
@@ -105,24 +106,4 @@ InitializeDisplay (
   IN LCD_INSTANCE* Instance
 );
 
-EFI_STATUS
-LcdIdentify (
-  VOID
-);
-
-EFI_STATUS
-LcdInitialize (
-  EFI_PHYSICAL_ADDRESS  VramBaseAddress
-);
-
-EFI_STATUS
-LcdSetMode (
-  IN UINT32  ModeNumber
-);
-
-VOID
-LcdShutdown (
-  VOID
-);
-
 #endif /* __ARM_VE_GRAPHICS_DXE_H__ */