ARM: OMAP2+: Fix uninitialized sr_inst

ARM: OMAP2+: Fix uninitialized sr_inst

BugLink: https://bugs.launchpad.net/bugs/1926999
[ Upstream commit fc85dc42a38405099f97aa2af709fe9504a82508 ]

Fix uninitialized sr_inst.

Fixes: fbfa463be8dc ("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>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>