powerpc/pseries: HVC early debug options should depend on HVC_CONSOLE

The pseries HVC early debug options, CONFIG_PPC_EARLY_DEBUG_LPAR and
CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI both require code that is part of the
hvc driver. If we turn them on but not CONFIG_HVC_CONSOLE then we get:

  arch/powerpc/kernel/built-in.o: In function `.udbg_early_init':
  arch/powerpc/kernel/built-in.o:(.debug_addr+0x9a00): undefined reference to `udbg_init_debug_lpar'

Similarly for HVSI. So make them both depend on CONFIG_HVC_CONSOLE.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/Kconfig.debug

@@ -149,14 +149,14 @@ config PPC_EARLY_DEBUG_BOOTX
 
 config PPC_EARLY_DEBUG_LPAR
 	bool "LPAR HV Console"
-	depends on PPC_PSERIES
+	depends on PPC_PSERIES && HVC_CONSOLE
 	help
 	  Select this to enable early debugging for a machine with a HVC
 	  console on vterm 0.
 
 config PPC_EARLY_DEBUG_LPAR_HVSI
 	bool "LPAR HVSI Console"
-	depends on PPC_PSERIES
+	depends on PPC_PSERIES && HVC_CONSOLE
 	help
 	  Select this to enable early debugging for a machine with a HVSI
 	  console on a specified vterm.