Enable performance optimizations (#595)

Fixes #594

---

`dtparam=sd_cqe=2`

> /boot/firmware/overlays/README

sd_cqe Modify Command Queuing behaviour on the main SD
                                interface. Legal values are:
                                0: disable CQ
1: allow CQ for known-good SD A2 cards, and all
                                   eMMC cards
2: allow CQ for all SD A2 cards that aren't
                                   known-bad, and all eMMC cards.
                                (2712 only, default "1")

We use SanDisk Extreme A2 which appear to be working well but are not
allow-listed yet. Let's test this setting and revert if it causes issues
or submit a PR to allow-list to https://github.com/raspberrypi/linux
See

* https://www.raspberrypi.com/news/sd-cards-and-bumper/
* https://forums.raspberrypi.com/viewtopic.php?t=367459

---

`SDRAM_BANKLOW`

See

* https://forums.raspberrypi.com/viewtopic.php?t=378276
* https://www.jeffgeerling.com/blog/2024/raspberry-pi-boosts-pi-5-performance-sdram-tuning

Author: sonnyp

documentation/docs/reference/hardware/changelog.md

@@ -34,6 +34,10 @@ Reduce power usage when powered off
 
 Does not automatically power on when connected anymore
 
+Much faster CPU and GPU performances
+
+Faster sdcard access
+
 -->
 
 ## v2.6

software/distro/setup/planktoscope-app-env/PlanktoScope/config.txt.snippet

@@ -8,5 +8,7 @@ disable_poe_fan=1
 dtparam=rtc_bbat_vchg=3000000
 # Enable self update for RPI 5 only
 bootloader_update=1
+# Enable CQHCI on SanDisk Extreme A2 sdcards
+dtparam=sd_cqe=2
 
 [all]

software/distro/setup/planktoscope-app-env/bootloader/boot.conf

@@ -5,3 +5,9 @@ HDMI_DELAY=0
 [pi5]
 POWER_OFF_ON_HALT=1
 WAIT_FOR_POWER_BUTTON=1
+SDRAM_BANKLOW=1
+
+[pi4]
+SDRAM_BANKLOW=3
+
+[all]