ionic: support ethtool get_module_eeprom_by_page

ionic: support ethtool get_module_eeprom_by_page

Add support for the newer get_module_eeprom_by_page interface.
Only the upper half of the 256 byte page is available for
reading, and the firmware puts the two sections into the
extended sprom buffer, so a union is used over the extended
sprom buffer to make clear which page is to be accessed.

With get_module_eeprom_by_page implemented there is no need
for the older get_module_info or git_module_eeprom interfaces,
so remove them.

Reviewed-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250415231317.40616-3-shannon.nelson@amd.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>