powerpc/64s: Avoid using EXCEPTION_PROLOG_1 macro in MASKABLE_*

Currently we use both EXCEPTION_PROLOG_1 and __EXCEPTION_PROLOG_1 in
the MASKABLE_* macros. As a cleanup, this patch makes MASKABLE_* to
use only __EXCEPTION_PROLOG_1. There is not logic change.
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/exception-64s.h

@@ -536,7 +536,7 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
 				    EXC_STD, SOFTEN_TEST_PR)
 
 #define MASKABLE_EXCEPTION_PSERIES_OOL(vec, label)			\
-	EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec);		\
+	__EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec);		\
 	EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
 
 #define MASKABLE_EXCEPTION_HV(loc, vec, label)				\
@@ -544,7 +544,7 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
 				    EXC_HV, SOFTEN_TEST_HV)
 
 #define MASKABLE_EXCEPTION_HV_OOL(vec, label)				\
-	EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);		\
+	__EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);		\
 	EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
 
 #define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)	\
@@ -565,7 +565,7 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
 					  EXC_HV, SOFTEN_TEST_HV)
 
 #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label)			\
-	EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);		\
+	__EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);		\
 	EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
 
 /*