soc/intel/quark: Clean up debug output levels

Change the debug output levels for quark:
*  Remove excess debug output
*  Change BIOS_DEBUG to BIOS_SPEW - exception in report_platform.c

TEST=Build and run on Galileo Gen2

Change-Id: I37d7ed21a7fc4c92efeb5b71dd01922d7d4b9192
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/16006
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/src/soc/intel/quark/reg_access.c b/src/soc/intel/quark/reg_access.c
index e5c0f0b..3d530b9 100644
--- a/src/soc/intel/quark/reg_access.c
+++ b/src/soc/intel/quark/reg_access.c
@@ -94,7 +94,7 @@
 		offset = (index - MTRR_PHYS_BASE(0))
 			+ QUARK_NC_HOST_BRIDGE_IA32_MTRR_PHYSBASE0;
 	else {
-		printk(BIOS_DEBUG, "index: 0x%08lx\n", index);
+		printk(BIOS_SPEW, "index: 0x%08lx\n", index);
 		die("Invalid MTRR index specified!\n");
 	}
 	return offset;