HID: u2fzero: fix compiling error in u2fzero_probe()

There is one compiling error in u2fzero_probe()->u2fzero_init_hwrng(),
this is because HW_RANDOM is not set.

drivers/hid/hid-u2fzero.o: In function `u2fzero_probe':
hid-u2fzero.c:(.text+0xc70): undefined reference to `devm_hwrng_register'

Fixes: 42337b9d("HID: add driver for U2F Zero built-in LED and RNG")
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NMao Wenan <maowenan@huawei.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/hid/Kconfig

@@ -1007,6 +1007,7 @@ config HID_U2FZERO
 	tristate "U2F Zero LED and RNG support"
 	depends on USB_HID
 	depends on LEDS_CLASS
+	depends on HW_RANDOM
 	help
 	  Support for the LED of the U2F Zero device.