include: fixup 'cm_setup_context' prototype

This patch changes the prototype cm_setup_context() to use struct entry_point_info
rather than the typedef'ed version of it. This fixes the following compilation error
seen with EL3_EXCEPTION_HANDLING = 1.

<snip>
In file included from bl31/ehf.c:19:
include/lib/el3_runtime/context_mgmt.h:35:49: error: unknown type name 'entry_point_info_t'
   35 | void cm_setup_context(cpu_context_t *ctx, const entry_point_info_t *ep);
      |                                                 ^~~~~~~~~~~~~~~~~~
<snip>
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
Change-Id: I73b059ff2dade2259cefd0f9a097c7ea4a88055d

include/lib/el3_runtime/context_mgmt.h

@@ -32,7 +32,7 @@ void cm_set_context(void *context, uint32_t security_state);
 void cm_init_my_context(const struct entry_point_info *ep);
 void cm_init_context_by_index(unsigned int cpu_idx,
 			      const struct entry_point_info *ep);
-void cm_setup_context(cpu_context_t *ctx, const entry_point_info_t *ep);
+void cm_setup_context(cpu_context_t *ctx, const struct entry_point_info *ep);
 void cm_prepare_el3_exit(uint32_t security_state);
 
 #ifdef __aarch64__