test/qtest/aspeed_smc-test: Introducing a "page_addr" data field

test/qtest/aspeed_smc-test: Introducing a "page_addr" data field

Currently, these test cases used the hardcode offset 0x1400000 (0x14000 * 256)
which was beyond the 16MB flash size for flash page read/write command testing.
However, the default fmc flash model of ast1030-a1 EVB is "w25q80bl" whose size
is 1MB. To test SoC flash models, introduces a new page_addr member in TestData
structure, so users can set the offset for flash page read/write command
testing.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20241127091543.1243114-5-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>