ipq40xx-mikrotik: rename ath10k_packages to smallbuffers (#2850)

The only device using the ATH10K_PACKAGES_IPQ40XX variable in
ipq40xx-mikrotik (the MikroTik hAP ac2) has little RAM and is
using ath10k-ct-smallbuffers by default at the moment. This is
just a suggestion to rename the variable in-case the wifi driver
ever has to be replaced by ath10k.

Analogue to 4a00b8ae

Signed-off-by: Felix Baumann <felix.bau@gmx.de>

targets/ipq40xx-mikrotik

 include 'mikrotik.inc'
 
-local ATH10K_PACKAGES_IPQ40XX = {}
+local ATH10K_PACKAGES_IPQ40XX_SMALLBUFFERS = {}
 
 device('mikrotik-hap-ac2', 'mikrotik_hap-ac2', {
-	packages = ATH10K_PACKAGES_IPQ40XX,
+	packages = ATH10K_PACKAGES_IPQ40XX_SMALLBUFFERS,
 })
 
 device('mikrotik-sxtsq-5-ac-rbsxtsqg-5acd', 'mikrotik_sxtsq-5-ac', {