ArmPkg/GenericWatchdogDxe: clean up the code

Clean up the code, by adding missing STATIC modifiers, drop
redundant casts, and get rid of the 'success handling' anti
pattern in the entry point code.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.inf

@@ -16,17 +16,16 @@
   FILE_GUID                      = 0619f5c2-4858-4caa-a86a-73a21a18df6b
   MODULE_TYPE                    = DXE_DRIVER
   VERSION_STRING                 = 1.0
-
   ENTRY_POINT                    = GenericWatchdogEntry
 
 [Sources.common]
   GenericWatchdogDxe.c
 
 [Packages]
-  MdePkg/MdePkg.dec
-  EmbeddedPkg/EmbeddedPkg.dec
   ArmPkg/ArmPkg.dec
   ArmPlatformPkg/ArmPlatformPkg.dec
+  EmbeddedPkg/EmbeddedPkg.dec
+  MdePkg/MdePkg.dec
 
 [LibraryClasses]
   ArmGenericTimerCounterLib
@@ -46,8 +45,8 @@
   gArmTokenSpaceGuid.PcdGenericWatchdogEl2IntrNum
 
 [Protocols]
-  gEfiWatchdogTimerArchProtocolGuid
-  gHardwareInterrupt2ProtocolGuid
+  gEfiWatchdogTimerArchProtocolGuid       ## ALWAYS_PRODUCES
+  gHardwareInterrupt2ProtocolGuid         ## ALWAYS_CONSUMES
 
 [Depex]
   gHardwareInterrupt2ProtocolGuid