ext : hal : mec1701 Add the MEC1701 external header.

Origin: Microchip CPG
URL: https://github.com/MicrochipTech/Peripheral-mec1701
Version: 0.2
Purpose: Official peripheral firmware library for MEC1701
License: Apache
Maintained-by: External

Signed-off-by: Francisco Munoz <francisco.munoz.ruiz@intel.com>

CMakeLists.txt

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+zephyr_include_directories_ifdef(CONFIG_HAS_MEC_HAL mec)

Kconfig

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+# Kconfig - Microchip MEC HAL drivers configuration
+#
+# SPDX-License-Identifier: Apache-2.0
+
+menuconfig HAS_MEC_HAL
+	bool "Microchip MEC HAL drivers support"
+	default n

README.txt

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+The MEC1701 HAL was downloaded from:
+
+https://github.com/MicrochipTech/Peripheral-mec1701
+
+Massaged the file with :
+sed -i -e 's/[ \t\r]*$//g' MCHP_MEC1701_bit_fields.h, then file was renamed
+to MCHP_MEC1701.h
+
+Field EOF was renamed to PEOF as it was collapsing with EOF defined in stdio.h