stm32: modules: fix stm32-hash package build

stm32: modules: fix stm32-hash package build

* Remove misplaced backslash to fix the build warning:

WARNING: can't parse line: FILES:=/drivers/crypto/stm32/stm32-hash.ko

* Add missing dependency package kmod-crypto-engine:

Package kmod-stm32-hash is missing dependencies for the following libraries:
crypto_engine.ko

Signed-off-by: Shiji Yang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18241
Signed-off-by: Hauke Mehrtens <[email protected]>
(cherry picked from commit 4efb4a26d28ecdd5fec9dc3a85bcb46a45a75f60)