sh: default to sparseirq.

As SH has a very sparse IRQ map by default, all new CPUs and boards
benefit from using sparseirq by default. Despite this, there are still a
few stragglers (mostly due to using a fixed IRQ range for their FPGA
IRQ mappings), and these still need to be converted over one by one. As
these are now in the minority, and we do not want to encourage this sort
of brain-damage in newer board ports, we force sparseirq on.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -726,8 +726,9 @@ config GUSA_RB
 	  disabling interrupts around the atomic sequence.
 
 config SPARSE_IRQ
-	bool "Support sparse irq numbering"
-	depends on EXPERIMENTAL
+	def_bool y
+	depends on SUPERH32 && !SH_DREAMCAST && !SH_HIGHLANDER && \
+		   !SH_RTS7751R2D && !HD64461 && !SH_7724_SOLUTION_ENGINE
 	help
 	  This enables support for sparse irqs. This is useful in general
 	  as most CPUs have a fairly sparse array of IRQ vectors, which