cmake: Fix capitalization of CSP_ZEPHYR
This is a typo.  It should be CSP_ZEPHYR instead.  CSP_ZEPHYR is
already set to 1 at the top CMakeLists.txt so it doesn't have any
effect.  It is here to imitate meson.build.
@@ -11,7 +11,7 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeRTOS")
set(CSP_FREERTOS 1)
add_subdirectory(freertos)
elseif(CMAKE_SYSTEM_NAME STREQUAL "Zephyr")
- set(CSP_Zephyr 1)
+ set(CSP_ZEPHYR 1)
add_subdirectory(zephyr)
else()
message(FATAL_ERROR "invalid system ${CMAKE_SYSTEM_NAME}")
