SDEI: Fix determining client EL

commit 2ccfcb2e

 ("SDEI: Determine client
EL from NS context's SCR_EL3") intended to read from SCR_EL3, but
wrongly read from SPSR_EL3 instead. This patch fixes that.

Change-Id: I8ffea39cc98ef59cb8e7a4c6ef4cb12011c58536
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>

services/std_svc/sdei/sdei_private.h

@@ -164,7 +164,7 @@ static inline unsigned int sdei_client_el(void)
 	cpu_context_t *ns_ctx = cm_get_context(NON_SECURE);
 	el3_state_t *el3_ctx = get_el3state_ctx(ns_ctx);
 
-	return read_ctx_reg(el3_ctx, CTX_SPSR_EL3) & SCR_HCE_BIT ? MODE_EL2 :
+	return read_ctx_reg(el3_ctx, CTX_SCR_EL3) & SCR_HCE_BIT ? MODE_EL2 :
 		MODE_EL1;
 }