test/qtest/ast2700-smc-test: Support to test AST2700

Add test_ast2700_evb function and reused testcases which are from
aspeed_smc-test.c for AST2700 testing. The base address, flash base address
and

test/qtest/ast2700-smc-test: Support to test AST2700

Add test_ast2700_evb function and reused testcases which are from
aspeed_smc-test.c for AST2700 testing. The base address, flash base address
and ce index of fmc_cs0 are 0x14000000, 0x100000000 and 0, respectively.
The default flash model of fmc_cs0 is "w25q01jvq" whose size is 128MB,
so set jedec_id 0xef4021.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>

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