disk: sdhc: Set LSB of command to 1 as end bit

The SD Card Physical Layer specification states in Table 7-1
(in section 7.3.1.1) that the LSB of the 48 bit command must
be set to 1 to act as an 'end bit'.

Fixes #33479

Signed-off-by: Rich Barlow <rich@bennellick.com>