reduce arduino coverage to avoid tests failing from external changes #142

Job	Run time
make check (--enable-sm2 --enable-sm3 --enable-sm4-gcm --enable-sm4-ccm --enable-sha3)	58s
make check (--enable-all --enable-sm2 --enable-sm3 --enable-sm4-ecb --enable-sm4-cbc --enable-sm4...	2m 56s
make check (--enable-sm2 --enable-sm3 --enable-sm4-ecb --enable-sm4-cbc --enable-sm4-ctr --enable...	1m 4s
	4m 58s

Provide feedback