microcode: add flexability: type & initramfs control

Bug reported that the MICROCODE option did not provide enough
flexability, as it enabled both AMD & Intel options by default, and
placed both sets of microcode into the initramfs.

Existing boolean option MICROCODE is now a string, which takes
no/all/amd/intel as inputs, describing which variant of kernel options
to enable. Boolean inputs are converted to no/all settings. This option
no longer include microcode in initramfs.

New option MICROCODE_INITRAMFS, enabled by default, includes the
microcode for matching kernel config options (INTEL/AMD) into the
initramfs. For users using sys-boot/grub-2.02-r1 or another bootloader
that supports multiple initramfs options, this option can be safely
disabled.

Fixes: https://bugs.gentoo.org/662492
Reported-by: Joerg Schaible <joerg.schaible@gmx.de>
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>

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