device-nokia-n900: set uniprocessor mode for kernel (MR 4299)

The OMAP 3430 in the Nokia N900 is a uniprocessor SoC, so disable SMP via
kernel command line. This appears to alleviate the ongoing kernel crashes
affecting the Nokia N900 in pmOS.

[ci:skip-build]: already built successfully in CI

device/community/device-nokia-n900/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Sicelo <absicsz@gmail.com>
 # Co-Maintainer: Danct12 <danct12@disroot.org>
 pkgname=device-nokia-n900
-pkgver=9.1
+pkgver=9.1.1
 pkgrel=0
 pkgdesc="Nokia N900"
 url="https://postmarketos.org"
@@ -200,7 +200,7 @@ caf9f4c45d11c28e1a6681255fafe5a286b0c417737fac1ca0ee37d3f82fd65c1712f5180375d781
 b76958bcba6e704bdf06194998f05bc5c86c0678329438b784bd77eaac9cab352aadc912bda8f3780406ff50fd3e05f6d32d021c49987285d1c0dc05ad5e73c4  modules.blocklist
 b50e7f37ffb1fa0bb782b117a4e8bcfdb722b6127c3e5d643e90cd901a1f4e65e77a0773ed418673c8195595347482be0c8096f5a723e840315ad61ccd043b66  n900-wlan-data.initd
 143c21f0b18a016d37cb44178e9daea09f128a90769b48353c03c3f245cb9b1f7e773b9ccee084973fc78ddd7a18c2642e54888a85bda7c7daecddc9a8c62eff  pointercal
-9aaae66ae159236346f67818c44da61aed84a63b3bac0c706492f198db82fc67c2378bcabaf260b695b980bf2faf144472f15355bb097b021551db9547f2e1bc  uboot-script.cmd
+239a54ae5c5effb53ccf4d658652c0462da57604b16b77a63627a17caa171caf82e3d1769f9c5afea8756415acbbf3b73db9b57715fce6c70ea3f29e5c6ac84a  uboot-script.cmd
 9e72035c88632d12895534e5aa5746f2c130c7dcdafa8702748d62b71ed0e1b5911b6e1f07f9b9e39b6072bbb662f66aead585baa1dcacb7d8c8953ca89b6762  10-nokia-modem.rules
 c6012aef28b096141b924fced226ec99fb93eb53b69c064a8887d8fecdf8dc08a3ba3db399e18d88374c6ef4c59013a30699c7e4d76e5cb771040582573a0527  90-touchscreen-dev.rules
 737d9e57e219a0220c5b1943375f325309323344fdf06973546c7d88ed9aec857657abd6b7861669873574f865e1c99719d411e0564dbfebe028f9e77d308491  x11-keymap

device/community/device-nokia-n900/uboot-script.cmd

@@ -2,7 +2,7 @@ setenv mmcnum 0
 setenv mmcpart 1
 setenv mmctype ext2
 setenv setup_omap_atag 1
-setenv bootargs init=/init.sh rw console=tty0 console=ttyS2 PMOS_NO_OUTPUT_REDIRECT PMOS_FORCE_PARTITION_RESIZE
+setenv bootargs init=/init.sh rw console=tty0 console=ttyS2 maxcpus=0 PMOS_NO_OUTPUT_REDIRECT PMOS_FORCE_PARTITION_RESIZE
 setenv mmckernfile /uImage
 setenv mmcinitrdfile /uInitrd
 setenv mmcscriptfile