subghz: Allow custom lora sync word #1217

Job	Run time
Build Testsuite	35s
doc	31s
Clippy	17s
Build (thumbv6m-none-eabi, stm32wl5x_cm0p, 1.62)	3m 8s
Format	11s
Build (thumbv6m-none-eabi, stm32wl5x_cm0p, beta)	32s
Build (thumbv7em-none-eabi, stm32wl5x_cm4, 1.62)	3m 31s
rustdoc	34s
Unit Tests (stm32wl5x_cm0p)	31s
Build (thumbv7em-none-eabi, stm32wl5x_cm4, beta)	51s
Unit Tests (stm32wl5x_cm4)	31s
Build (thumbv7em-none-eabi, stm32wle5, 1.62)	3m 9s
Unit Tests (stm32wle5)	32s
Build (thumbv7em-none-eabi, stm32wle5, beta)	32s
Deploy Nightly Docs	0s
crates.io release	0s
	15m 25s

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