remoteproc/omap: fix a sparse warning

This patch fixes a sparse warning in the omap remoteproc code
when OMAP_REMOTEPROC is disabled.

include/linux/platform_data/remoteproc-omap.h:76:13: warning: symbol 'omap_rproc_reserve_cma' was not declared. Should it be static?
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>

include/linux/platform_data/remoteproc-omap.h

@@ -50,7 +50,7 @@ void __init omap_rproc_reserve_cma(void);
 
 #else
 
-void __init omap_rproc_reserve_cma(void)
+static inline void __init omap_rproc_reserve_cma(void)
 {
 }