16k: Align shared libraries and executables to 4k by default

The default ELF segment alignment will be 4096. This alignment
can be overriden by setting the desired alignment in
PRODUCT_MAX_PAGE_SIZE_SUPPORTED flag. The alignment has to be
a multiple of the configured kernel page size.

Test: Built changes for Pixel 4a, 6 and checked alignment.
Bug: 276963698
Bug: 276801883
(cherry picked from https://android-review.googlesource.com/q/commit:05d4d901146d96634ad0ff3a9982c9c87c394f18)
Merged-In: Icb380041a5b27da1fa0d86b302e1e7cde9a236d7
Change-Id: Icb380041a5b27da1fa0d86b302e1e7cde9a236d7

android/variable.go

@@ -218,6 +218,7 @@ type productVariables struct {
 	DeviceVndkVersion                     *string  `json:",omitempty"`
 	DeviceCurrentApiLevelForVendorModules *string  `json:",omitempty"`
 	DeviceSystemSdkVersions               []string `json:",omitempty"`
+	DeviceMaxPageSizeSupported            *string  `json:",omitempty"`
 
 	RecoverySnapshotVersion *string `json:",omitempty"`
 
@@ -505,6 +506,7 @@ func (v *productVariables) SetDefaultConfig() {
 		DeviceSecondaryArchVariant: stringPtr("armv8-a"),
 		DeviceSecondaryCpuVariant:  stringPtr("generic"),
 		DeviceSecondaryAbi:         []string{"armeabi-v7a", "armeabi"},
+		DeviceMaxPageSizeSupported: stringPtr("4096"),
 
 		AAPTConfig:          []string{"normal", "large", "xlarge", "hdpi", "xhdpi", "xxhdpi"},
 		AAPTPreferredConfig: stringPtr("xhdpi"),