msm: ipa: Moved uc loaded check before sending the uc command

For sending the halt command to stop gsi Q6 channel uc loaded check
was not required. Moved check before sending uC commands.

Change-Id: I013a210e88a1b178ccbbf83104fce66bccae970c
Acked-by: Ashok Vuyyuru <avuyyuru@qti.qualcomm.com>
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>