common/arch.h: added e2k arch definition #1614

Job	Run time
code formatting check	26s
cppcheck	9m 48s
min features with gcc	2m 1s
min features with g++	2m 54s
min features with clang	2m 23s
max features with gcc	3m 40s
max features with g++	2m 26s
max features with clang	2m 49s
max features with gcc and DEBUG	2m 22s
max features with gcc for 32-bit arch (legacy OS)	1m 32s
max features with g++ for 32-bit arch (legacy OS)	2m 30s
max features with clang for 32-bit arch (legacy OS)	1m 45s
	34m 36s

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