soc/intel/quark: Add bootblock_c_entry

Add the bootblock_c_entry routine to make it more explicit where the
code transitions from assembler to C.

TEST=Build and run on Galileo Gen2

Change-Id: Ib5f580c30b58d3c82fedddf63c368e617d401515
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/16064
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/soc/intel/quark/bootblock/esram_init.S b/src/soc/intel/quark/bootblock/esram_init.S
index f3852c4..d982cdd 100644
--- a/src/soc/intel/quark/bootblock/esram_init.S
+++ b/src/soc/intel/quark/bootblock/esram_init.S
@@ -534,6 +534,6 @@
 	push	%ebp
 
 	/* We can call into C functions now */
-	call bootblock_main_with_timestamp
+	call bootblock_c_entry
 
 	/* Never reached */