powerpc/fsl_booke: Fix setting of exec flag when setting TLBCAMs

Building tqm8541_defconfig results in:

	arch/powerpc/mm/nohash/fsl_book3e.c: In function 'settlbcam':
	arch/powerpc/mm/nohash/fsl_book3e.c:126:40: error: '_PAGE_BAP_SX' undeclared (first use in this function)
	  126 |         TLBCAM[index].MAS3 |= (flags & _PAGE_BAP_SX) ? MAS3_SX : 0;
	      |                                        ^~~~~~~~~~~~
	arch/powerpc/mm/nohash/fsl_book3e.c:126:40: note: each undeclared identifier is reported only once for each function it appears in
	make[3]: *** [scripts/Makefile.build:277: arch/powerpc/mm/nohash/fsl_book3e.o] Error 1
	make[2]: *** [scripts/Makefile.build:540: arch/powerpc/mm/nohash] Error 2
	make[1]: *** [scripts/Makefile.build:540: arch/powerpc/mm] Error 2
	make: *** [Makefile:1868: arch/powerpc] Error 2

This is because _PAGE_BAP_SX is not defined when using 32 bits PTE.

Now that _PAGE_EXEC contains both _PAGE_BAP_SX and _PAGE_BAP_UX, it can be used instead.

Fixes: 01116e6e ("powerpc/fsl_booke: Take exec flag into account when setting TLBCAMs")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/91a0235e7f2a85308b84aa5b9efd8d022e2b899a.1635226743.git.christophe.leroy@csgroup.eu

arch/powerpc/mm/nohash/fsl_book3e.c

@@ -123,7 +123,6 @@ static void settlbcam(int index, unsigned long virt, phys_addr_t phys,
 	TLBCAM[index].MAS2 |= (flags & _PAGE_ENDIAN) ? MAS2_E : 0;
 
 	TLBCAM[index].MAS3 = (phys & MAS3_RPN) | MAS3_SR;
-	TLBCAM[index].MAS3 |= (flags & _PAGE_BAP_SX) ? MAS3_SX : 0;
 	TLBCAM[index].MAS3 |= (flags & _PAGE_RW) ? MAS3_SW : 0;
 	if (mmu_has_feature(MMU_FTR_BIG_PHYS))
 		TLBCAM[index].MAS7 = (u64)phys >> 32;
@@ -133,6 +132,8 @@ static void settlbcam(int index, unsigned long virt, phys_addr_t phys,
 		TLBCAM[index].MAS3 |= MAS3_UR;
 		TLBCAM[index].MAS3 |= (flags & _PAGE_EXEC) ? MAS3_UX : 0;
 		TLBCAM[index].MAS3 |= (flags & _PAGE_RW) ? MAS3_UW : 0;
+	} else {
+		TLBCAM[index].MAS3 |= (flags & _PAGE_EXEC) ? MAS3_SX : 0;
 	}
 
 	tlbcam_addrs[index].start = virt;