OMAP4: hwmod data: Add PRM context register offset

Add a 'context_offs' entry in the prcm.omap4 structure to all
IPs when applicable.
The offset will be used to retrieve the per module context lost
information now available on OMAP4.
Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

arch/arm/plat-omap/include/plat/omap_hwmod.h

@@ -363,6 +363,7 @@ struct omap_hwmod_omap2_prcm {
 struct omap_hwmod_omap4_prcm {
 	u16		clkctrl_offs;
 	u16		rstctrl_offs;
+	u16		context_offs;
 	u8		submodule_wkdep_bit;
 };