staging: rtl8192u: ieee80211_softmac: Move a large data struct onto the heap

staging: rtl8192u: ieee80211_softmac: Move a large data struct onto the heap

Fixes the following W=1 kernel build warning(s):

 drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c: In function ‘ieee80211_rx_frame_softmac’:
 drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c:2009:1: warning: the frame size of 1152 bytes is larger than 1024 bytes [-Wframe-larger-than=]

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Romain Perier <romain.perier@gmail.com>
Cc: Allen Pais <apais@linux.microsoft.com>
Cc: Andrea Merello <andrea.merello@gmail.com>
Cc: linux-staging@lists.linux.dev
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210414181129.1628598-29-lee.jones@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>