phy: broadcom: sr-usb: fix Wvoid-pointer-to-enum-cast warning

phy: broadcom: sr-usb: fix Wvoid-pointer-to-enum-cast warning

'version' is an enum, thus cast of pointer on 64-bit compile test with
W=1 causes:

  phy-bcm-sr-usb.c:314:13: error: cast to smaller integer type 'enum bcm_usb_phy_version' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast]

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230810111958.205705-3-krzysztof.kozlowski@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>