swtpm_ioctl: double default poll timeout On very slow architectures the 10s timeout is too slow and can fail tests. For example on MIPS: https://buildd.debian.org/status/fetch.php?pkg=swtpm&arch=mipsel&ver=0.7.1-1.1&stamp=1684146306&raw=0 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1036101 Double it to 20s, which has been used for ~2 years in Debian and has proven to be sufficient to avoid spurious failures. Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com>