test/qtest/aspeed_smc-test: Introduce a new TestData to test different BMC SOCs

test/qtest/aspeed_smc-test: Introduce a new TestData to test different BMC SOCs

Currently, these test cases are only used for testing fmc_cs0 for AST2400.
To test others BMC SOCs, introduces a new TestData structure.
Users can set the spi base address, flash base address, jedesc id and so on
for different BMC SOCs and flash model testing.

Introduce new helper functions to make the test case more readable.

Set spi base address 0x1E620000, flash_base address 0x20000000
and jedec id 0x20ba19 for fmc_cs0 with n25q256a flash for AST2400
SMC model testing.

To pass the TestData into the test case, replace qtest_add_func with
qtest_add_data_func.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20241127091543.1243114-3-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>