sh: enable PERF_USE_VMALLOC across the board.

The vast majority of SH platforms want this, and the few that don't
aren't going to care one way or the other. Enable it across the board.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -18,6 +18,7 @@ config SUPERH
 	select HAVE_DMA_API_DEBUG
 	select HAVE_DMA_ATTRS
 	select HAVE_PERF_EVENTS
+	select PERF_USE_VMALLOC
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_BZIP2
 	select HAVE_KERNEL_LZMA