drivers/usbhost/usbhost_cdcecm.c: Converted CDC-ECM to lower half

Converted USB Host CDC-ECM to a lower half driver.
Removed existing full network driver callbacks and replaced with lower
half.

Signed-off-by: daniellizewski <daniellizewski@geotab.com>

boards/arm/stm32h5/nucleo-h563zi/configs/nshusbnet/defconfig

@@ -16,7 +16,6 @@ CONFIG_ARCH_CHIP_STM32H563ZI=y
 CONFIG_ARCH_CHIP_STM32H5=y
 CONFIG_ARCH_INTERRUPTSTACK=2048
 CONFIG_ARCH_STACKDUMP=y
-CONFIG_ARMV8M_STACKCHECK_NONE=y
 CONFIG_BOARD_LOOPSPERMSEC=9251
 CONFIG_BUILTIN=y
 CONFIG_DEBUG_ASSERTIONS=y
@@ -31,6 +30,7 @@ CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
 CONFIG_IDLETHREAD_STACKSIZE=2048
 CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_STACKSIZE=4096
 CONFIG_LINE_MAX=64
 CONFIG_NET=y
 CONFIG_NETDB_DNSCLIENT=y
@@ -56,6 +56,7 @@ CONFIG_READLINE_CMD_HISTORY=y
 CONFIG_READLINE_TABCOMPLETION=y
 CONFIG_RR_INTERVAL=200
 CONFIG_SCHED_LPWORK=y
+CONFIG_SCHED_LPWORKSTACKSIZE=4096
 CONFIG_SCHED_WAITPID=y
 CONFIG_STACK_COLORATION=y
 CONFIG_STM32H5_USART3=y