tracing: Remove PPC32 wart from config TRACING_SUPPORT

config TRACING_SUPPORT has an exception for PPC32, because PPC32
didn't have irqflags tracing support.

But that hasn't been true since commit 5d38902c ("powerpc: Add
irqtrace support for 32-bit powerpc") (Jun 2009).

So remove the exception for PPC32 and the comment.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

kernel/trace/Kconfig

@@ -110,11 +110,7 @@ config GENERIC_TRACER
 #
 config TRACING_SUPPORT
 	bool
-	# PPC32 has no irqflags tracing support, but it can use most of the
-	# tracers anyway, they were tested to build and work. Note that new
-	# exceptions to this list aren't welcomed, better implement the
-	# irqflags tracing for your architecture.
-	depends on TRACE_IRQFLAGS_SUPPORT || PPC32
+	depends on TRACE_IRQFLAGS_SUPPORT
 	depends on STACKTRACE_SUPPORT
 	default y