zephyr: CMakeLists.txt: use new CONFIG_SOC_ for 8ULP

Zephyr PR#70219 changes the SOC name of i.MX8ULP from MIMX8ULP
to MIMX8UD7. This means that all `CONFIG_SOC_*` configurations
will be changed from the `MIMX8ULP`-based naming to the
`MIMX8UD7`-based naming. As such, this commit updates the name
of the configuration used by the `zephyr/CMakeLists.txt` file.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>

Author: LaurentiuM1234

zephyr/CMakeLists.txt

@@ -290,7 +290,7 @@ if (CONFIG_SOC_MIMX8MP_ADSP)
 	set(PLATFORM "imx8m")
 endif()
 
-if (CONFIG_SOC_MIMX8ULP_ADSP)
+if (CONFIG_SOC_MIMX8UD7_ADSP)
 	zephyr_library_sources(
 		${SOF_DRIVERS_PATH}/generic/dummy-dma.c
 		${SOF_DRIVERS_PATH}/imx/edma.c