drivers: bcma: remove set but not used variable `addrh` and `sizeh`

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/bcma/scan.c: In function 'bcma_erom_get_addr_desc':
drivers/bcma/scan.c:219 warning:
variable `addrh` and `sizeh` set but not used [-Wunused-but-set-variable]

Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200721083935.13306-1-zhengyongjun3@huawei.com