drivers: espi: mchp: Report correct length during OOB Rx operation

Use correct HAL macro to report amount of bytes received.

Signed-off-by: Jose Alberto Meza <jose.a.meza.arellano@intel.com>
diff --git a/drivers/espi/espi_mchp_xec.c b/drivers/espi/espi_mchp_xec.c
index ed601dd..f6c3533 100644
--- a/drivers/espi/espi_mchp_xec.c
+++ b/drivers/espi/espi_mchp_xec.c
@@ -32,7 +32,6 @@
 
 /* OOB Rx length */
 #define ESPI_XEC_OOB_RX_LEN         0x7F00ul
-#define ESPI_XEC_OOB_RX_LEN_MASK    0x7F00ul
 
 /* BARs as defined in LPC spec chapter 11 */
 #define ESPI_XEC_KBC_BAR_ADDRESS    0x00600000
@@ -516,7 +515,7 @@
 	}
 
 	/* Check if buffer passed to driver can fit the received buffer */
-	u32_t rcvd_len = ESPI_OOB_REGS->RX_LEN & ESPI_XEC_OOB_RX_LEN_MASK;
+	u32_t rcvd_len = ESPI_OOB_REGS->RX_LEN & MCHP_ESPI_OOB_RX_LEN_MASK;
 
 	if (rcvd_len > pckt->len) {
 		LOG_ERR("space rcvd %d vs %d", rcvd_len, pckt->len);