Revert "Revert "Move /var/log to RAM for Mellanox SN2700, Nokia 7215 …

…and Dell S6100 (sonic-net#15077)" (sonic-net#16775)"

This reverts commit 61683d9.

Signed-off-by: Stephen Sun <stephens@nvidia.com>

device/dell/x86_64-dell_s6100_c2538-r0/installer.conf

@@ -1,3 +1,3 @@
 CONSOLE_PORT=0x2f8
 CONSOLE_DEV=1
-ONIE_PLATFORM_EXTRA_CMDLINE_LINUX="module_blacklist=gpio_ich,wdat_wdt acpi_no_watchdog=1 nos-config-part=/dev/sda12 i2c-i801.disable_features=0x10"
+ONIE_PLATFORM_EXTRA_CMDLINE_LINUX="module_blacklist=gpio_ich,wdat_wdt acpi_no_watchdog=1 nos-config-part=/dev/sda12 logs_inram=on i2c-i801.disable_features=0x10"

device/mellanox/x86_64-mlnx_msn2700-r0/installer.conf

@@ -1 +1 @@
-ONIE_PLATFORM_EXTRA_CMDLINE_LINUX="acpi_enforce_resources=lax acpi=noirq libata.force=noncq"
+ONIE_PLATFORM_EXTRA_CMDLINE_LINUX="acpi_enforce_resources=lax acpi=noirq logs_inram=on libata.force=noncq"

device/nokia/armhf-nokia_ixs7215_52x-r0/installer.conf

@@ -1 +1,2 @@
 VAR_LOG_SIZE=4096
+ONIE_PLATFORM_EXTRA_CMDLINE_LINUX="logs_inram=on"

platform/marvell-armhf/platform.conf

@@ -176,8 +176,7 @@ prepare_boot_menu() {
     fi
     BORDER='echo "---------------------------------------------------";echo;'
     fw_setenv ${FW_ARG} print_menu "$BORDER $BOOT1 $BOOT2 $BOOT3 $BORDER" > /dev/null
-
-    fw_setenv ${FW_ARG} linuxargs "net.ifnames=0 loopfstype=squashfs loop=$image_dir/$FILESYSTEM_SQUASHFS systemd.unified_cgroup_hierarchy=0 varlog_size=$VAR_LOG_SIZE loglevel=4 ${extra_cmdline_linux}" > /dev/null
+    fw_setenv ${FW_ARG} linuxargs "net.ifnames=0 loopfstype=squashfs loop=$image_dir/$FILESYSTEM_SQUASHFS systemd.unified_cgroup_hierarchy=0 varlog_size=$VAR_LOG_SIZE loglevel=4 ${extra_cmdline_linux} ${ONIE_PLATFORM_EXTRA_CMDLINE_LINUX}" > /dev/null
     fw_setenv ${FW_ARG} linuxargs_old "net.ifnames=0 loopfstype=squashfs loop=$image_dir_old/$FILESYSTEM_SQUASHFS systemd.unified_cgroup_hierarchy=0 varlog_size=$VAR_LOG_SIZE loglevel=4" > /dev/null
 
     # Set boot configs