staging: r8188eu: remove test code for efuse shadow map

The EFUSE_ShadowMapUpdate function has a parameter to replace the
actual read operations with test reads. The only caller of
EFUSE_ShadowMapUpdate does not use this test mode.

Remove the read test code from EFUSE_ShadowMapUpdate and the low-level
functions that it calls.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211113185518.23941-4-martin@kaiser.cx


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>