cnss_sdio: set wdrv only when cnss_sdio_wlan_register_driver succeeds

When wlan platform driver routine cnss_sdio_wlan_register_driver
returns non-zero, sdio wlan driver fails to install, and structure
allocated by sdio wlan driver will be freed.

wdrv in cnss_sdio_info is used to point to struture allocated by
sdio wlan driver and it should be set when no error in the routine
cnss_sdio_wlan_register_driver.

CRs-Fixed: 2099754
Change-Id: I0488b1da03da1fe3bfe2fc319059b66e09dea12f
Signed-off-by: bings <bings@codeaurora.org>