Fix crash in deinit path

Remove the nrf_wifi_osal_deinit invocation in the failure case of
nrf70_bm_sys_fmac_init/nrf70_bm_rt_fmac_init, since the
nrf70_bm_sys_fmac_deinit/nrf70_bm_rt_fmac_deinit need an handle to the
os_ops. Also they invoke the osal deinit themselves thereby making the
invocation from the init functions unnecessary.

Signed-off-by: Sachin D Kulkarni <Sachin.Kulkarni@nordicsemi.no>

Author: sachinthegreen

nrf70_bm_lib/source/radio_test/nrf70_bm_core.c

@@ -99,7 +99,6 @@ int nrf70_bm_rt_fmac_init(void)
 
 	return 0;
 deinit:
-	nrf_wifi_osal_deinit();
 	nrf70_bm_rt_fmac_deinit();
 err:
 	return -1;

nrf70_bm_lib/source/system/nrf70_bm_core.c

@@ -400,7 +400,6 @@ int nrf70_bm_sys_fmac_init(void)
 
 	return 0;
 deinit:
-	nrf_wifi_osal_deinit();
 	nrf70_bm_sys_fmac_deinit();
 err:
 	return -1;