ec/google/chromeec: provide way to query ioport range

In order to provide other stages access to the ioport range
required by the ChromeEC provide google_chromeec_ioport_range()
function to fill in the details. Currently, the ioport range is
only consumed by the LPC implemenation. Also allow ec_lpc.c to be built
for the bootblock stage.

Change-Id: I6c181b42e80e71fe07e8fa90df783107287f16ad
Signed-off-by: Aaron Durbin  <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/14769
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/ec/google/chromeec/ec.h

@@ -21,6 +21,9 @@
 #include <stdint.h>
 #include "ec_commands.h"
 
+/* Fill in base and size of the IO port resources used. */
+void google_chromeec_ioport_range(uint16_t *base, size_t *size);
+
 #ifndef __PRE_RAM__
 int google_chromeec_i2c_xfer(uint8_t chip, uint8_t addr, int alen,
 			     uint8_t *buffer, int len, int is_read);