broadwell: Add support for E0 stepping

Prepare for new stepping.

BUG=chrome-os-partner:28234
BRANCH=None
TEST=none yet

Change-Id: I9b9545c21c590d5bb42c7cdc8399d02d8d17f35b
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/205160
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/broadwell/broadwell/cpu.h

@@ -36,6 +36,7 @@
 #define CPUID_HASWELL_HALO	0x40661
 #define CPUID_BROADWELL_C0	0x306d2
 #define CPUID_BROADWELL_D0	0x306d3
+#define CPUID_BROADWELL_E0	0x306d4
 
 /* CPU bus clock is fixed at 100MHz */
 #define CPU_BCLK		100

src/soc/intel/broadwell/cpu.c

@@ -661,6 +661,7 @@ static struct cpu_device_id cpu_table[] = {
 	{ X86_VENDOR_INTEL, CPUID_HASWELL_ULT },
 	{ X86_VENDOR_INTEL, CPUID_BROADWELL_C0 },
 	{ X86_VENDOR_INTEL, CPUID_BROADWELL_D0 },
+	{ X86_VENDOR_INTEL, CPUID_BROADWELL_E0 },
 	{ 0, 0 },
 };
 

src/soc/intel/broadwell/romstage/report_platform.c

@@ -41,6 +41,7 @@ static struct {
 	{ CPUID_HASWELL_HALO,   "Haswell Perf Halo" },
 	{ CPUID_BROADWELL_C0,   "Broadwell C0" },
 	{ CPUID_BROADWELL_D0,   "Broadwell D0" },
+	{ CPUID_BROADWELL_E0,   "Broadwell E0" },
 };
 
 static struct {