Support Tiny-2 series MCUs

[tpimh]

As I understand from this line: https://github.com/Optiboot/optiboot/blob/81bdd404ff70b76fed716a10bbde90149d98e647/optiboot/bootloaders/optiboot/Makefile.mega0#L1 Only Mega-0, Tiny-0, and Tiny-1 families are supported. What modifications are actually needed to compile Optiboot_X for the following list of MCUs: ATtiny{4,8,16,32}2{4,6,7}?

Tiny-2 family list expanded:

• ATtiny424
• ATtiny426
• ATtiny427
• ATtiny824
• ATtiny826
• ATtiny827
• ATtiny1624
• ATtiny1626
• ATtiny1627
• ATtiny3224
• ATtiny3226
• ATtiny3227

[WestfW]

That appears to be true. It looks like "DrAzzy" had added those to his copy of optiboot_x: https://github.com/SpenceKonde/megaTinyCore/tree/master/megaavr/bootloaders/optiboot_x

[WestfW]

Fixed: https://github.com/Optiboot/optiboot/commit/45d4c1a5207bacff5de18d8ab5d2a734435c9644