kernel: fix kmod-tpm 4.19 dependencies

This patch fixes the ath79-nand build error:
|Package kmod-tpm is missing dependencies for the following libraries:
|rng-core.ko

by making it depend on rng-core from 4.19 onwards.
This should work as 4.9 is gone so only 4.14 and 4.19
are there.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

package/kernel/linux/modules/other.mk

@@ -1085,6 +1085,7 @@ $(eval $(call KernelPackage,bmp085-spi))
 define KernelPackage/tpm
   SUBMENU:=$(OTHER_MENU)
   TITLE:=TPM Hardware Support
+  DEPENDS:= +!LINUX_4_14:kmod-random-core
   KCONFIG:= CONFIG_TCG_TPM
   FILES:= $(LINUX_DIR)/drivers/char/tpm/tpm.ko
   AUTOLOAD:=$(call AutoLoad,10,tpm,1)