ARM: OMAP2+: Fix uninitialized sr_inst

[ Upstream commit fc85dc42 ]

Fix uninitialized sr_inst.

Fixes: fbfa463b ("ARM: OMAP2+: Fix smartreflex init regression after dropping legacy data")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>