Old bash version don't support associative array variables.  Avoid to use
associative array variables to avoid error.

Without this, old bash version will report error as fellowing
[   15.954042] Kernel panic - not syncing: sysrq triggered crash
[   15.955252] CPU: 1 PID: 167 Comm: sh Not tainted 5.18.0-rc1-00208-gb7d075db2fd5 #4
[   15.956472] Hardware name: Hobot J5 Virtual development board (DT)
[   15.957856] Call trace:
./scripts/decode_stacktrace.sh: line 128: ,dump_backtrace: syntax error: operand expected (error token is ",dump_backtrace")

Link: https://lkml.kernel.org/r/20220409180331.24047-1-schspa@gmail.comSigned-off-by: Schspa Shi <schspa@gmail.com>
Cc: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>