Implement EEPROM Emulation block device on NOR/NAND Flash

[daniel-0723]

Summary of changes

EEPROMs have the ability to update individual bytes of memory million times over and the programmed locations retain the data over a long period even when the system is powered down.
We create a VEE(vitual EEPROM Emulation) on Flash to approaches to Flash like EEPROM.
The Flash could be SPI/QSPI/OSPI NOR Flash or SPI NAND Flash.

Impact of changes

Migration actions required

Documentation

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Pull request type

[] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[x] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[] No Tests required for this change (E.g docs only update)
[] Covered by existing mbed-os tests (Greentea or Unittest)
[x] Tests / results supplied as part of this PR

This driver is tested on DISCO_L4R9I.

target	platform_name	test suite	test case	passed	failed	result	elapsed_time (sec)
DISCO_L4R9I-GCC_ARM	DISCO_L4R9I	storage-blockdevice-tests-tests-blockdevice-vee_block_device	Testing background thread	1	0	OK	619.72
DISCO_L4R9I-GCC_ARM	DISCO_L4R9I	storage-blockdevice-tests-tests-blockdevice-vee_block_device	Testing read write random blocks	1	0	OK	1.15

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Reviewers

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